Quinquevalent compounds of uranium—I Alkoxides and complex chlorides

Bradley, D. C.; Chakravarti, B. N.; Chatterjee, A.

doi:10.1016/0022-1902(57)80043-8

Cited by 38 publications

(10 citation statements)

References 7 publications

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“…Interestingly, [NEt 4 ] 2 [UOCl 5 ] is described as intense blue in colour, 118 whereas an earlier paper suggested this complex was pale green. 122 The IR spectrum of [NEt 4 ] 2 [UOCl 5 ] contains two peaks at 913 cm -1 and 813 cm -1 , assigned to U=O vibrations, an observation that has not been adequately explained. 118,123 The reactivity of this complex has not been well explored, but unsurprisingly it is prone to disproportionation.…”

Section: Uranyl and Its Analoguesmentioning

confidence: 99%

Metal–ligand multiple bonding in uranium: structure and reactivity

2010

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There is a growing interest in uranium coordination chemistry, particularly as it relates to metal-ligand multiple bonding, and in the last decade significant progress has been made in synthesizing oxo, imido, mu-nitrido, and carbene-containing complexes of uranium. This review summarizes the synthesis, structure and reactivity of these complexes, starting from the inception of the field in 1981. Particular attention is focused on the recent developments in this area, such as the synthesis of the bis(imido) analogues of the uranyl ion, and the isolation of the first mu-nitrido complexes of this element.

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Section: Uranyl and Its Analoguesmentioning

confidence: 99%

Metal–ligand multiple bonding in uranium: structure and reactivity

2010

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“…Alkoxides of most of the metals have been described [1,2] including a number of the actinide elements, notably thorium [3], uranium [4][5][6][7][8][9][10], neptunium [11] and plutonium [12], Several years ago it was observed that the pentahalides of protactinium dissolved in anhydrous alcohols [13] and indeed this property was exploited to remove the halides from sealed capillaries in which they had been weighed prior to analysis [14]. These observations strongly suggested the formation of alkoxides.…”

Section: R£sum6mentioning

confidence: 99%

Protactinium(V) Ethoxide

Maddock¹,

Matos²

1972

Radiochimica Acta

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Band 18, Heft 2 1972 A. G. MADDOCK and A. PIRES DE MATOS, Protactinium(V) Ethoxide 71view that an intermediate of large negative charge is formed, some of which is not further reduced or fully reduced, due to the repulsive effect of the diffuse double layer field. A comparison of the limiting currents at various stages of coulometric reduction shows that as the current density is increased and as the electrolysis proceeds, the cathode potential decreases from about -0.4 Y vs. SCE at 1mA to about -0.8 V vs. SCE at 20 mA. Although the potential never gets to more negative values than the half wave potential of the second wave (-1.09 V), the height of both waves decreases gradually as more current is passed. This fact can only be explained by assuming a chemical interaction between the various species of technetium present in the solution. Apparently, these species are not in equilibrium, as the ratio i x /i 2 does not remain constant, but decreases continuously as more charge is passed through the solution. At present a satisfactory explanation cannot be offered for this phenomenon.Effect of the supporting electrolyte composition on the polarogramsThe pn of the solutions strongly affects the shape and the location of the polarograms. The effect is strongly pronounced on the first reduction step. At Ph2 a sharp maximum is observed on the first wave, and it gradually looses its height as the ρ Η is increased. At pjj.5 it disappears completely. This maximum cannot be suppressed by the conventional maximum suppressors (e.g. Triton x-100) indicating that it is presumably connected with the change of the double-l/ 3,/ 4/5 / y / // / / "0 0 0 0 0 -E,Volt vs. SCE Tig. 3. The effect of solution composition (p H ) on the shape of polarograms of 2.64 χ ΙΟ-Ή TcO«-in 0.5M H 3 P0 4 . pa adjusted to the following values with 5 Μ NaOH: 1: pH 2; 2: pa4; 3: ρκ5; 4: ραβ; 5: p H 7 layer structure due to changes in the composition of the supporting electrolyte. In Fig. 3 are shown polarograms of solutions of different ps and composition. AcknowledgementThe authors gratefully acknowledge the helpful criticism and the suggestions made by Dr. SummaryThe preparation and some properties of protactinium(V) ethoxide are described. The extent of polymerisation of the ethoxide in benzene solution is reported. The polymerisation is confirmed by the infra-red spectrum of the compound. ZusammenfassungDie Herstellung von Protaktinium(V)-Äthoxid und einige seiner Eigenschaften werden beschrieben. Der Umfang der Polymerisation des Äthoxids in einer Benzollösung wird angegeben. Die Polymerisation wird durch das Infrarotspektrum der Verbindung bestätigt. R£sum6On dicrit la preparation et quelques caract6ristiques de l'ethoxyde de protactinium (V). On indique 6galement le degr£ de polym6risation de l'ethoxyde en solution benz6nique. La polymerisation est confirmee par le spectre infra-rouge du compost.Alkoxides of most of the metals have been described [1, 2] including a number of the actinide elements, notably thorium [3], uranium [4-10], neptunium [11...

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“…Coordination compounds of uranium(V) have likewise been little explored. The peculiar compounds (CbHbNEOUOCL and UOCI3.C2H5OH possibly contain uranium(V) (46). The latter has an apparent molecular complexity in ethanol of 0.84, which suggests partial ionization; assuming the uranium atoms to be sixcoordinate, the following equilibria have been postulated:…”

Section: Complexes With Sulfur Donorsmentioning

confidence: 99%

“…The pyridinium compound reacts with alcoholic ammonia to give uranium pentaethoxide, U(OC2H6)s, and other pentaalkoxides may be obtained from this by alcohol interchange (42, 46). Other methods of preparation of the pentaalkoxides have been described (187,267,268,520).…”

Section: Complexes With Sulfur Donorsmentioning

confidence: 99%

The Coördination Chemistry of the Actinides.

Comyns¹

1960

Chem. Rev.

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Quinquevalent compounds of uranium—I Alkoxides and complex chlorides

Cited by 38 publications

References 7 publications

Metal–ligand multiple bonding in uranium: structure and reactivity

Metal–ligand multiple bonding in uranium: structure and reactivity

Protactinium(V) Ethoxide

The Coördination Chemistry of the Actinides.

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